[KYUUBI #4954] [DOCS] Fix variable reference in quick_start_with_jdbc

fix typo, replace kyuubiJdbcUrl with kyuubiJdbcUrlTemplate.

### _Why are the changes needed?_
fix typo, should be String.format(kyuubiJdbcUrlTemplate, ...)

### _How was this patch tested?_
just fix typo, no test need.
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #4954 from uicosp/patch-1.

Closes #4954

8abf04d87 [鱼肚] Update quick_start_with_jdbc.md

Authored-by: 鱼肚 <uicosp@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>

docs/quick_start/quick_start_with_jdbc.md

@@ -80,7 +80,7 @@ public class KyuubiJDBCDemo {
     String clientPrincipal = args[0]; // Kerberos principal
     String clientKeytab = args[1];    // Keytab file location
     String serverPrincipal = arg[2];  // Kerberos principal used by Kyuubi Server
-    String kyuubiJdbcUrl = String.format(kyuubiJdbcUrl, clientPrincipal, clientKeytab, serverPrincipal);
+    String kyuubiJdbcUrl = String.format(kyuubiJdbcUrlTemplate, clientPrincipal, clientKeytab, serverPrincipal);
     try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) {
       try (Statement stmt = conn.createStatement()) {
         try (ResultSet rs = st.executeQuery("show databases")) {